Something that is thin is much narrower than it is long. A thin cable carries the signal to a computer. James's face was thin, finely boned, and sensitive.

Thin is also used of things that are not as thick as you expect. Something thin is narrow or not very thick. If you wear thin socks on a cold winter day, your toes might start to feel numb. Thin can describe something that is narrow and slender, like a hair or a thread. Having a small distance between the top and bottom or front and back surfaces not thick; Not having a lot of extra flesh on the body not fat Having relatively little extent from one surface or side to the opposite;

Having a small distance between the top and bottom or front and back surfaces not thick; Not having a lot of extra flesh on the body not fat Having relatively little extent from one surface or side to the opposite; Not thick. See examples of thin used in a sentence.